PWM/VFM step-down DC/DC Converter
Controller
51 6(5,(6
NO. EA-065-0204
OUTLINE
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FEATURES
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5DQJH RI ,QSXW 9ROWDJH 9∼9
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2XWSXW 9ROWDJH
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∼
9
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6WDQGE\ &XUUHQW 7\S $
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APPLICATIONS
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1
R1223N
BLOCK DIAGRAM
OSC
V
IN
V
OUT
EXT
Vref
PWM/VFM
CONTROL
Protection
Soft Start
Chip Enable
CE
GND
SELECTION GUIDE
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51[[[[[[
↑↑↑ ↑
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Code
D
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Contents
6HWWLQJ 2XWSXW 9ROWDJH 9
287
6WHSZLVH VHWWLQJ ZLWK D VWHS RI 9 LQ WKH UDQJH RI 9 WR 9 LV SRVVLEOH
'HVLJQDWLRQ RI 2VFLOODWRU )UHTXHQF\
IL[HG
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$ N+] ZLWK D 3:09)0 DOWHUQDWLYH FLUFXLW /DWFKW\SH SURWHFWLRQ
% N+] ZLWK D 3:09)0 DOWHUQDWLYH FLUFXLW /DWFKW\SH SURWHFWLRQ
& N+] ZLWKRXW D 3:09)0 DOWHUQDWLYH FLUFXLW /DWFKW\SH SURWHFWLRQ
' N+] ZLWKRXW D 3:09)0 DOWHUQDWLYH FLUFXLW /DWFKW\SH SURWHFWLRQ
( N+] ZLWK D 3:09)0 DOWHUQDWLYH FLUFXLW 5HVHWW\SH SURWHFWLRQ
) N+] ZLWK D 3:09)0 DOWHUQDWLYH FLUFXLW 5HVHWW\SH SURWHFWLRQ
* N+] ZLWKRXW D 3:09)0 DOWHUQDWLYH FLUFXLW 5HVHWW\SH SURWHFWLRQ
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F
G
2
R1223N
PIN CONFIGURATION
SOT-23-5
5
4
V
IN
EXT
(mark side)
CE GND V
OUT
1
2
3
PIN DESCRIPTION
Pin No.
Symbol
&(
*1'
9
287
(;7
9
,1
&KLS (QDEOH 3LQ
*URXQG 3LQ
3LQ IRU 0RQLWRULQJ 2XWSXW 9ROWDJH
([WHUQDO 7UDQVLVWRU 'ULYH 3LQ
3RZHU 6XSSO\ 3LQ
Description
ABSOLUTE MAXIMUM RATINGS
Symbol
9
,1
9
(;7
9
&(
9
287
,
(;7
3'
7RSW
7VWJ
Item
9
,1
6XSSO\ 9ROWDJH
(;7 3LQ 2XWSXW 9ROWDJH
&( 3LQ ,QSXW 9ROWDJH
9
287
3LQ ,QSXW 9ROWDJH
(;7 3LQ ,QGXFWRU 'ULYH 2XWSXW &XUUHQW
3RZHU 'LVVLSDWLRQ
2SHUDWLQJ 7HPSHUDWXUH 5DQJH
6WRUDJH 7HPSHUDWXUH 5DQJH
Rating
∼9
,1
∼9
,1
∼9
,1
∼
∼
Unit
9
9
9
9
P$
P:
&
&
3
R1223N
ELECTRICAL CHARACTERISTICS
•
R1223Nxx2A (,C,E,G) Output Voltage : Vo
Symbol
9
,1
9
287
∆9
287
∆7
IRVF
∆IRVF∆7
,
''
,VWE
,
(;7+
,
(;7/
,
&(+
,
&(/
9
&(+
9
&(/
0D[GW\
9)0GW\
7VWDUW
Item
2SHUDWLQJ ,QSXW 9ROWDJH
6WHSGRZQ 2XWSXW 9ROWDJH
6WHSGRZQ 2XWSXW 9ROWDJH
7HPSHUDWXUH &RHIILFLHQW
2VFLOODWRU )UHTXHQF\
2VFLOODWRU )UHTXHQF\
7HPSHUDWXUH &RHIILFLHQW
6XSSO\ &XUUHQW
6WDQGE\ &XUUHQW
(;7 ´+µ 2XWSXW &XUUHQW
(;7 ´/ 2XWSXW &XUUHQW
µ
&( ´+µ ,QSXW &XUUHQW
&( ´/ ,QSXW &XUUHQW
µ
&( ´+µ ,QSXW 9ROWDJH
&( ´/ ,QSXW 9ROWDJH
µ
2VFLOODWRU 0D[LPXP 'XW\
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9
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9R 9
PV
IRU ULVLQJ HGJH
PV
9
&(
9→9R 9
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9
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9
&(
9R 9
9
287
9R 9→9
9
,1
9
&(
9R 9
,
287
P$
&
≤
7RSW
≤
&
9
,1
9
&(
9R 9
,
287
P$
&
≤
7RSW
≤
&
9
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9 9
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9
9
287
9
9
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9 9
287
9
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9 9
287
9
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287
9
9
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9
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9 9
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9
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9
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9 9
&(
9
9
287
9
9
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9 9
287
9→9
9
,1
9 9
287
9→9
Conditions
Min.
9R×
9R
Typ.
Max.
9R×
7RSW &
Unit
9
9
SSP&
N+]
&
$
$
P$
P$
$
$
9
9
7SURW
4
R1223N
•
R1223Nxx2B (,D,F,H) Output Voltage : Vo
Symbol
9
,1
9
287
∆9
287
∆7
)RVF
∆IRVF∆7
,
''
,VWE
,
(;7+
,
(;7/
,
&(+
,
&(/
9
&(+
9
&(/
0D[GW\
9)0GW\
7VWDUW
Item
2SHUDWLQJ ,QSXW 9ROWDJH
6WHSGRZQ 2XWSXW 9ROWDJH
6WHSGRZQ 2XWSXW 9ROWDJH
7HPSHUDWXUH &RHIILFLHQW
2VFLOODWRU )UHTXHQF\
2VFLOODWRU )UHTXHQF\
7HPSHUDWXUH &RHIILFLHQW
6XSSO\ &XUUHQW
6WDQGE\ &XUUHQW
(;7 ´+µ 2XWSXW &XUUHQW
(;7 ´/ 2XWSXW &XUUHQW
µ
&( ´+µ ,QSXW &XUUHQW
&( ´/ ,QSXW &XUUHQW
µ
&( ´+µ ,QSXW 9ROWDJH
&( ´/ ,QSXW 9ROWDJH
µ
2VFLOODWRU 0D[LPXP 'XW\
&\FOH
9)0 'XW\ &\FOH
'HOD\ 7LPH E\ 6RIW6WDUW
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FLUFXLW
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9
,1
9R 9
9
&(
9→9R 9
VSHFLILHG DW
IRU ULVLQJ HGJH
9
,1
9
&(
9R 9
9
287
9R 9→9
9
,1
9
&(
9R 9
,
287
P$
&
≤
7RSW
≤
&
9
,1
9
&(
9R 9
,
287
P$
&
≤
7RSW
≤
&
9
,1
9 9
&(
9
9
287
9
9
,1
9 9
&(
9 9
287
9
9
,1
9 9
(;7
9 9
287
9
9
&(
9
9
,1
9 9
(;7
9 9
287
9
9
&(
9
9
,1
9 9
&(
9
9
287
9
9
,1
9 9
&(
9
9
287
9
9
,1
9 9
287
9→9
9
,1
9 9
287
9→9
Conditions
Min.
9R×
9R
Typ.
Max.
9R×
7RSW &
Unit
9
9
SSP&
N+]
&
$
$
P$
P$
$
$
9
9
PV
7SURW
PV
5
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